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I would also take a taxi. I know Paris like the back of my hand - better than I even know my own city of Washington, DC - and I'm no wuss and I speak French and frequently travel all over the world on my own, but if there is one place in Paris that I just don't like to be (at any time of day or night), it's Chatelet-les-Halles métro/RER.

I know...here comes kerouac to say I'm silly, but that station is the very largest subway station in the entire world. It's not, even with good signage, terribly easy to navigate. You'll be tired, disoriented. Take a taxi.

Personally, I would take a taxi. If I wanted to economize, I'd take Roissybus to Opera, then Bus 27 (about 30 minutes with lots of scenery along the way) to Les Gobelins. You could also take a taxi , or Metro line 7 from Opera.

Djkbooks, I do want to economize though not at the expense of safety so your suggestion sounds like a good compromise. Do you have any idea of the taxi fare from Opera to Les Gobelins? I would try the metro first but If I don't succeed in getting a ticket from the machine (magnetic strip or chip&pin accepted?), I will go for the taxi. Is the taxi line just outside the metro stn? read about some cases of overcharging and such so crossing my fingers.

Is it worth considering to take RER to Denfert Rochereau then taxi (understand it's about 15 euros) and believe being a RER stn, the taxi line will be right outside and more populated even ard 11pm?

2 kind TA souls had earlier responded in the affirmative to my query if it's safe to take a 5-min walk from les Gobelins metro to my hostel (lone female with one cabin luggage) between 11pm-MN. Just to see if that's still the case here hmm.

There is a taxi stand within steps of Roissybus stop at Opera where it is far more likely there will be taxis waiting (they derive much business form bus passengers), whereas taxis are not regularly waiting at Denfert-Rochereau, though they do cruise by from time to time. I just wouldn't count on getting one quickly there that late at night.

G7 Estimator is 14-17 Euros for the ride that time of night.

There's always Bus 27...pay 2 Euros to the driver for a ticket. Later in the evening the bus stops only when someone wants to get on or off, so is often a very swift ride.